- Add a CheckLockResultTracker to track result of async lock check so that
it can finish on configuration change;
- Let the pending lock check finish and ignore subsequent check requests;
- Add a mDisappearing flag to prevent running disappear animation
multiple times;
- Check whether activity is still active after disappear animation
before setting result and finishing it;
- Remove no longer used mNumWrongConfirmAttempts;
Bug:23190499
Change-Id: If1784d3d1fcc152ac06137b12748b9def5726692
